PhD (Medicine), Associate Professor E.A. Trutneva¹
Associate Professor T.M. Grigorenko¹
Postgraduate A.V. Zalivnova¹
Associate Professor Yu.L. Selyakov²
PhD, Associate Professor A.N. Denisenko^3
1RyazSMU, Ryazan
²VILE of the FPS of Russia, Vologda
³State Lesgaft University of Physical Culture, Sports and Health, St. Petersburg

Introduction. The study of the interrelationships of maximum exercise tolerance (PH) and variability of the duration of cardio intervals (CI) bit by bit during stress testing is likely to reveal pre-start markers of physical performance.
The purpose of the study is to identify probabilistic pre–launch markers of FN tolerance according to the time series of variability in the duration of CI during stress testing of fighters of the CMS, MS qualification.
Methodology and organization of the study. The maximum bicycle ergometric testing was carried out according to an individual protocol [1-3]. The sequential time series of CI – cardiorhythmogram (CRG) – was divided into periods: pre–start (PS) - (30 seconds) preceding the beginning of ergometry; start (CT) – (30 seconds) from the beginning of rotational locomotion with a load of 50 Watts; for 1, 2, 3, etc. minutes of the loading period. Exercise tolerance (PH) was taken into account by the difference between the maximum achieved and the power of the first stage. Nonparametric criteria (Statistica 10.0) were used for statistical processing. The CRG of each period was subjected to linear mathematical modeling according to the formula: Y=aX+b, where X is the ordinal number of the CI in the time series, Y is the duration of the CI, "a" is the model parameter characterizing the rate of variability of the CRG and "b" is the model parameter determining its constant component.
The results of the study and conclusions. The pre-start period has the maximum number of connections, and therefore the prognostic potential, it allows us to assume the quality of both the stress and recovery periods, as well as the maximum tolerance of FNL. However, despite the amount, the intensity of the connection (about 0.4) for 4 minutes of load, 1 and 2 minutes of recovery leave more questions than answers in a predictive sense. In this sense, the start period behaves more responsibly, while in fact the entire load period has strong relationships with it, and the recovery period is 0.5 and higher. The loading period of 1-3 minutes is less interesting, since, according to the forecast of portability, the FN has the same capabilities, and according to the forecast of recovery, it is significantly inferior to the start period.

Keywords: performance, bicycle ergometry, heart rate.

Literature

1. Petrov A.B. Stress adaptation of the heart rate of qualified wrestlers / A.B. Petrov, A.V. Kalinin, M.V. Baranova, N.S. Birchenko // Theory and practice of physical culture. - 2022. – No. 10. – pp. 36-38.
2. Lapkin M.M. Adaptive mechanisms of maximum efficiency // M.M. Lapkin, E.A. Trutneva, D.S. Melnikov, K.Yu. Shubin // Theory and practice of physical culture. 2021. – No. 8. – pp. 17-19.
3. Systemic organization of physiological functions, ensuring maximum physical performance / M.M. Lapkin, E.A.Trutneva, A.V. Kalinin // Man. Sport. Medicine. – 2022. – Vol. 22, No. S2. – pp. 37-45